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Micro-Cup Architecture for Printing and Coating Asymmetric 2d-Material-Based Solid-State Supercapacitors. | LitMetric

Micro-Cup Architecture for Printing and Coating Asymmetric 2d-Material-Based Solid-State Supercapacitors.

Small

Laboratory for Functional Polymers, Swiss Federal Laboratories for Materials Science and Technology (Empa), Überlandstrasse 129, Dübendorf, CH-8600, Switzerland.

Published: August 2023

AI Article Synopsis

  • High energy density micro-supercapacitors (MSCs) are increasingly needed for compact electronics and systems, pushing researchers to innovate materials and designs.
  • A new "cup & core" architecture allows for easier manufacturing of asymmetric devices by avoiding precise alignment of electrodes, utilizing techniques like laser ablation and screen-printing to create intricate structures.
  • This design improves ion diffusion, leading to a significant boost in volumetric capacitance and a reduced time constant, ultimately achieving a high energy density of 3.99 µWh/cm², outperforming similar MSCs based on MXenes and graphene.

Article Abstract

High energy density micro-supercapacitors (MSCs) are in high demand for miniaturized electronics and microsystems. Research efforts today focus on materials development, applied in the planar interdigitated, symmetric electrode architecture. A novel "cup & core" device architecture that allows for printing of asymmetric devices without the need of accurately positioning the second finger electrode here have been introduced. The bottom electrode is either produced by laser ablation of a blade-coated graphene layer or directly screen-printed with graphene inks to create grids with high aspect ratio walls forming an array of "micro-cups". A quasi-solid-state ionic liquid electrolyte is spray-deposited on the walls; the top electrode material -MXene inks- is then spray-coated to fill the cup structure. The architecture combines the advantages of interdigitated electrodes for facilitated ion-diffusion, which is critical for 2D-material-based energy storage systems by providing vertical interfaces with the layer-by-layer processing of the sandwich geometry. Compared to flat reference devices, volumetric capacitance of printed "micro-cups" MSC increased considerably, while the time constant decreased (by 58%). Importantly, the high energy density (3.99 µWh cm ) of the "micro-cups" MSC is also superior to other reported MXene and graphene-based MSCs.

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Source
http://dx.doi.org/10.1002/smll.202300357DOI Listing

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